Leptodactylus fallax, commonly known as the mountain chicken or giant ditch frog, is a species of frog that is native to the Caribbean islands of Dominica and Montserrat. The population has declined 81% in the last ten years and this species is now critically endangered. In 2004 it was estimated that the population possibly was as low as 8,000 individuals. One of the main threats is human consumption. The fungal disease chytridiomycosis has also had a dramatic effect on the population. On Montserrat it is known as the mountain chicken, on Dominica, it is known as the crapaud.